4.6 Backflow Preventer. TRIANGLE TUBE PEA110

4.0

Boiler Piping

- Consult heat exchanger for maximum set point of limit.

- For wiring of the limit, reference Fig. 15, page 29, using the external manual reset strip. This will provide a "hard" lockout requiring a manual reset of the control.

4.6

Backflow Preventer

- Use a backflow preventer valve in the make-up water supply to the unit as required by local codes.

4.7

Boiler System Piping Applications

CAUTION

Undersized expansion tanks will cause

Refer to the expansion tank manufacturer instructions for additional installation details.

Connect the expansion tank to an air separator only if the air separator is located on the suc-

Always locate and install the system fill connection at the same location as the expansion tank connection to the system.

BEST PRACTICE

It is recommended on all piping applications to utilize a primary/secondary piping arrangement as a means to provide freeze protection of the boiler, which is an integral function of the boiler control.

Maintain the minimum boiler flow rate shown in Graphs 1 through 6 on pages 94 through 96. For other piping arrangements, contact ACV-Triangle Tube

Technical Support or consult other approved/recognized design arrangements.

4.8.1 Diaphragm Expansion Tank of the air separator to remove residual air from the system.

4.8.2 Closed-Type Expansion Tank

BEST PRACTICE

On piping applications utilizing a single zone or other recognized piping design arrangements, it is recommended that the installer uses flow/check valves with weighted seats at or near the appliance to prevent gravity circulation.

4.8

Expansion Tank and Makeup

Water

the boiler volume (3 gallons [12 L]) and the system volume and temperature.

upwards toward the expansion tank 1 inch per 5 feet of piping. Use 3/4” piping for the expansion tank to allow air within the system to rise.

CAUTION closed-type expansion tank system. Air must remain in the system and be returned to the expansion tank to provide an air cushion. An automatic air vent would cause air to be vented from the system resulting in a water-logged expansion tank.

4.9

Circulator

The PRESTIGE Excellence requires an external circulator to provide circulation through the boiler.

16